As for the constituents that make up the planet, iron is the largest at 64.13%, and nickel at 3.66% is twice as much as the Earth. All elements are present, but hydrogen is 0.4ppm, which is very little, at the level of 1% of the earth, and oxygen is 14.44%, which is only about 2/3 of the earth.[6] Unusually, compared to the size of the planet, the core is 3,600 km in diameter, 75% of the diameter of Mercury, the mantle is 600 km, and the crust is about 100 to 200 km thick.
